@Serwan Scheppers I'd say that it's a bit of a weird one On one side yeah there is more risk of injury, but on the other hand, it makes for a way more "allround" solution and the injury is due to the less modular nature of the sandbag which causes progressive overload, which the user might not be ready for. There is also an ego aspect to this, as someone who can deadlift 180kg's can often only lift a 80kg sandbag. Their unstable form makes them a totally different experience from the tools made for lifting. It's like a pendulum, if machines are on one side, and barbells on the middle, sandbags would be on the other side. Especially for grappling i see the benefit of these, because a human body also is not made to be lifted and will move in a different way each time. Kettlebells on the other hand are one that i think is very underrated, the unstable nature and the conditioning aspect are not to be underestimated. A kettlebell is just such a versatile tool for your posterior chain, also for rotational exercises (wood chops, russian twists). And I think it also can build speed, similar to how olympic lifts do.